Initial data commit

Task/Pointers-and-references/Java/pointers-and-references.java

@@ -0,0 +1,9 @@
+ public class Foo { public int x = 0; }
+
+ void somefunction() {
+     Foo a; // this declares a reference to Foo object; if this is a class field, it is initialized to null
+     a = new Foo(); // this assigns a to point to a new Foo object
+     Foo b = a; // this declares another reference to point to the same object that "a" points to
+     a.x = 5; // this modifies the "x" field of the object pointed to by "a"
+     System.out.println(b.x); // this prints 5, because "b" points to the same object as "a"
+ }